Vaisala DRYCAP DMT340 SERIES Guide de l'utilisateur télécharger pdf (Page 138)

User's Guide _______________________________________________________________________

136 __________________________________________________________________ M210704EN-G

Sensor Functions

AutoCal

To obtain the best possible accuracy in measurements taken in dry

environments, DMT340 has a built-in AutoCal. During the AutoCal,

DMT340 adjusts the dry-end reading to correspond to the calibrated

values. This is a unique and patented method to avoid errors in accuracy

when monitoring low dewpoints.

The AutoCal is carried out if the following criteria for the measurement

environment are fulfilled:

- Relative humidity must be <2 % (DMT340 DRYCAP® M-sensor).

- Temperature must be 0<T<80 ºC (or sensor warming activated for -

40<T<80 ºC).

- Humidity environment must be stable. The maximum change in the

dewpoint can be 2 ºC in 15 seconds.

NOTE

AutoCal cannot operate if the above conditions are not fulfilled.

If the adjustment in the AutoCal reaches a preset maximum value or if

the AutoCal correction fails, for example, because of unstable conditions,

a new AutoCal will take place later (if the automatic AutoCal is turned

on).

Automatic AutoCal

As a default, the automatic AutoCal in DMT340 is turned on. In this

mode, the calibration takes place automatically if the dewpoint or

temperature changes significantly, typically more than 10 ºC. However, if

there are no changes in the conditions, the AutoCal will take place

repeatedly after one hour from the last AutoCal.

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Vaisala DRYCAP DMT340 SERIES Guide de l'utilisateur Page 138